Proper drying of the solid insulation is one determining factor for the lifetime of power transformers. During manufacturing or after repair it is necessary to dry the solid insulation, for example down to less than 0.5 per cent water content in cellulose for new units. However, different sizes, designs and raw materials require different drying times, which make the definition of drying times challenging. A direct monitoring of the insulation wetness during the dry-out process would help for optimising this process. However, presently only indirect methods are used for estimating the residual moisture during drying, which imply various uncertainties. This paper from Omicron introduces a new approach of using the dielectric response analysis for monitoring the drying process.

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OMICRON is an international company serving the electrical power industry with innovative testing and diagnostic solutions.

OMICRON is an international company serving the electrical power industry with innovative testing and diagnostic solutions.

The application of OMICRON products provides users with the highest level of confidence in the condition assessment of primary and secondary equipment on their systems. Services offered in the area of consulting, commissioning, testing, diagnosis, and training make the product range complete.

Customers in more than 140 countries rely on the company’s ability to supply leading-edge technology of excellent quality. Broad application knowledge and extraordinary customer support provided by offices in North America, Europe, south and east Asia and the Middle East, together with a worldwide network of distributors and representatives, make the company a market leader in its sector.